memo is warning there's a small risk for diabetic patients who may have been exposed to reused insulin needles between october 2010 and november of last year. the health scare has the attention of at least one lawmaker in new york new york state. >> they obviously changed the needles each time but they would put -- should have been putting a patient's name on the cartridge so that it would never be used by someone else. >> the v.a.'s office in buffalo is offering free blood tests to anyone worried they may have been exposed. >>> time 17:32. tomorrow -- time is 7:32. tomorrow in marin county you can trade in old guns in exchange for cash. the county is providing $40,000 for a four-county gun buy-back event. they'll pay $200 for semiautomatic weapons, $100 for other guns. those guns can be turned into police stations in know sad dough, san a -- in novato, san rafael, lashes spur, points reyes -- larkspur, point reyes. coming up at 7:50, why gun show officials expect attendance records to be broken and how they say president obama may have something to do with it. >>> a fire in san jose h